hsa_circ_0023642 promotes the growth, invasion and migration of GC cells in vitro. A, Knockdown of circ‐0023642 inhibited cell proliferation significantly in MKN‐45 cells. B, Knockdown of circ‐0023642 inhibited cell proliferation significantly in SGC‐7901 cells. C, MKN‐45 and SGC‐7901 cells infected with si‐hsa_circ_0023642 displayed significantly lower migration capacity compared with those infected with si‐NC. Scale: 40 × 10. D, Knockdown of hsa_circ_0023642 decreased MKN‐45 and SGC‐7901 cell migration significantly. E, MKN‐45 and SGC‐7901 cells infected with si‐hsa_circ_0023642 displayed significantly lower invasion capacity compared with those infected with si‐NC. Scale: 40 × 10. F, Knockdown of hsa_circ_0023642 decreased MKN‐45 and SGC‐7901 cell invasion significantly. **P < .01. GC, gastric cancer; si‐NC, negative control